Uplink Modulation Strategies in 4g Wireless Cellular Systems
نویسندگان
چکیده
New upcoming wireless communication standards utilizing Ortogonal Frequency Division Multipexing (OFDM) provide high data rates and good signal cell coverage that makes their application extremely promising in fourthcoming years. Despite of its widely recognized benefits, sensitivity to the nonlinear amplification remains still a special issue to be solved. Recent solution to overcome this problem has been itroduced by 3GPP consortion in Release 8, where the the particular precoded OFDMA scheme, a closely related OFDMA alternative, is considered. This approach is widely recognized as a Single Carrier Frequency Division Multiplexing (SC-FDMA) and is characterized by using Discrete Fourier Transformation (DFT) for the signal spreading/despreading purposes. In this paper, we present the mutual performance evaluation of discussed techniques performing over nonlinear AWGN channels and state some significant considerations resulting from this.
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